GRAS proteins play crucial roles in plant growth and development. Scarecrow-like protein 26 (SCL26, also known as AT4G08250) from Arabidopsis belongs to the GRAS family of plant specific transcription factors. Nodulation signaling pathway 2 (NSP2) from Medicago is a homologue required for rhizobial Nod factor signalling. NSP2 functions downstream of Nod-factor-induced calcium spiking and a calcium/calmodulin-dependent protein kinase.